diff --git a/R/worker.r b/R/worker.r
index 3eb0a92c..466c4a27 100644
--- a/R/worker.r
+++ b/R/worker.r
@@ -41,7 +41,7 @@ worker = function(master, timeout=getOption("clustermq.worker.timeout", 600),
             msg = zmq$receive()
             if (is.null(msg$id)) {
                 # more information if #146, #179, #191 happen again
-                message("msg: ", msg)
+                message("msg: ", paste(names(msg), collapse=", "))
                 next
             }
             delta = proc.time() - tic
diff --git a/README.md b/README.md
index be2c73c0..447375a8 100644
--- a/README.md
+++ b/README.md
@@ -178,8 +178,8 @@ limited to:
   [User guide](https://mschubert.github.io/clustermq/articles/userguide.html).
 * Bug reports: Let us know if something does not work as expected. Be sure to
   include a self-contained [Minimal Reproducible
-  Example](https://stackoverflow.com/help/minimal-reproducible-example) that
-  illustrates the behavior.
+  Example](https://stackoverflow.com/help/minimal-reproducible-example) and set
+  `log_worker=TRUE`.
 * Code contributions: Have a look at the [`good first
   issue`](https://github.com/mschubert/clustermq/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
   tag. Please discuss anything more complicated before putting a lot of work